With Joe Mauer and Drew Butera banged up, it was revealed Friday that the Twins were calling up Double-A catcher Chris Herrmann to help out behind the plate. That decision, however, isn’t sitting well with veteran Rene Rivera, who was Triple-A Rochester’s primary catcher this year:

I guess I should not expect promises to be kept. Best of luck to everyone #Disappointed#Lies

It seems Rivera thought he was promised the callup should the Twins add an extra catcher.

Neither Rivera nor Herrmann was on the 40-man roster, so that had nothing to do with the choice. It likely came down to the fact that Herrmann is something of a prospect as a potential backup, while Rivera is just a journeyman who probably wasn’t going to be back in the organization next year anyway.

Still, Rivera is the second scorned Twin this year to take to twitter to voice his displeasure with the organization. Former prospect Dan Osterbrock did so in May after the Twins misdiagnosed his arm problems and released him.

What is it about Rivera that has so many readers fired up about him? He’s as disappointing at the plate as Butera, but doesn’t have the defensive upside. They are each well liked by their pitchers, but that’s about the only place there seems to be a question where Rivera might excel. Neither has it in them to ever make a strong case to be an All-Star. Given the state of things in 2011-12, why should the Twins continue to invest in mediocrity rather than investigate other options?